RFR: 8277488: Add expiry exception for Digicert (geotrustglobalca) expiring in May 2022

[Rajan Halade]

We are checking with CA if root cert can be removed. Meanwhile, updated test to add expiry exception.

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Commit messages:
 - 8277488: Add expiry exception for Digicert (geotrustglobalca) expiring in May 2022

Changes: https://git.openjdk.java.net/jdk/pull/7537/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7537&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8277488
  Stats: 3 lines in 1 file changed: 2 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7537.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7537/head:pull/7537

PR: https://git.openjdk.java.net/jdk/pull/7537